JP6737851B2 - Removal method of existing tunnel structure by box roof method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for widening an existing tunnel structure that removes an existing tunnel structure and replaces it with a new tunnel structure when the existing tunnel structure exists as an obstacle at a construction crossing portion.

To replace an existing underground structure such as an existing underground passage that is installed under a railroad or under a road with a new underground structure, it is necessary to use support piles or temporary bridges in the conventional construction method. For temporary removal at the girder (construction girder) and removal of the existing one, the removal method by hand picking etc. is generally used.

In this case, it takes a lot of time to remove the existing structure, which causes a problem that the construction period is extended.

The following Patent Document 1 has been proposed as a device that does not require a temporary receiving girder or the like, and in an existing structure that is composed of an upper floor and side walls and has at least the edges of the upper floor and side walls cut off, at least on the upper surface of the upper floor. A plurality of steel plates are laid in parallel in the longitudinal direction of the existing structure, and the end portions of these steel plates are fixed to a fixed point, and the front end of the existing structure is attached to the rear end side of the existing structure. After following the matched state, while removing the side wall of the existing structure by appropriate means such as breaking, the existing structure is advanced together with the upper floor of the existing structure using the lower surface of the parallel steel plate as a guide surface to advance the existing structure. Replace objects with ready-made structures.
Japanese Patent Publication No. 06-105025

The following Patent Document 2 has been proposed as a device in which the rail of Patent Document 1 can be omitted.
JP, 2008-231863, A

In Patent Document 2, as shown in FIG. 16, the existing structure 1 is built in the ground below the rail 3, and the lower floor slab 11 of the existing structure 1 is separated from the side walls 1b and 1b. In addition, the temporary support 8 is installed on the lower floor slab 11 and the upper floor slab 1a is supported by the temporary support 8 to separate the upper floor slab 1a from the side walls 1b and 1b. A box 2 wider than the existing structure 1 is butt-followed to the structure 1, and the box 2 is propelled from the side of the box 2 while destroying the side walls 1b and 1b. The structures 1a and 11 and the temporary support 8 are integrally moved forward and removed from the buried position under the rail to replace the existing structure 1 with the box 2 to make the structure wider.

Friction cutter plates 6, 6, 6,... 6 made of steel plates are laid in parallel on the upper surface of the upper floor slab 1a of the existing structure 1 with both end faces in the lengthwise direction thereof being in contact with each other.

Further, box-shaped roofs 7 on which friction cutter plates 6 are mounted are placed in parallel at the same height positions as the upper floor slab 1a on both sides of the upper floor slab 1a of the existing structure 1 so as to be laterally connected. In addition to forming the parallel pipes, the box-shaped roof 7 is driven downward from both ends of the parallel pipes to form the parallel pipes stacked in a line.

After separating the front ends of all the friction cutter plates 6 on the parallel pipes from the box-shaped roof 7, all the friction cutters which are aligned in the longitudinal direction with the front ends of all the friction cutter plates 6 which are lined up in a row with each other. The front end of the plate 6 is tightly adhered to the side surface of the ground from which the friction cutter plate 6 projects by welding or the like to a fixing frame supported thereby.

On the other hand, on the start side 4, all friction cutter plates 6 projecting rearward are fixed to all friction cutter plates 6 by connecting the connecting members made of H-shaped steel or the like arranged orthogonally on these steel plates. By doing so, they are integrally connected.

Further, a lower floor slab 11 is laid on the floor surface between the lower ends of the side walls 1b, 1b of the existing structure 1 so as to be slidably movable in the length direction of the existing structure 1.

At this time, the sliding face material 9 is laid and fixed over substantially the entire width of the lower floor slab 11, and the lower floor slab 11 is laid on the sliding face material 9 so as to be slidable in the longitudinal direction.

After laying the lower floor slab 11 between the lower ends of the existing structure 1, a temporary supporting work 8 is installed on the lower floor slab 11, and the existing structure is supported with the temporary supporting work 8 supporting the upper floor slab 1a. The upper floor slab 1a of the article 1 and the side walls 1b, 1b are separated.

In this way, after the upper floor slab 1a separated from the upper ends of the side walls 1b, 1b is supported by the temporary support structure 8, the box 2 is installed on the starting side 4 behind the existing structure 1 and installed. Following the structure 1, a strut 18 is interposed between the propelling (original push) jack 17 mounted on the front surface of the reaction force receiving wall member and the rear end surface of the box 2.

A blade mouth frame is attached to the front end face of the box body 2, and a plurality of middle push jacks 15 are attached to the front end face of the blade mouth frame.

After arranging the box body 2, the reaction force receiving wall member, and the like on the starting side 4 in this way, when the intermediate push jack 15 is extended, the upper floor slab 1a of the existing structure 1 and the parallel box-shaped roofs 7 and 7 are separated. The friction cutter plate 6 fixed in a stationary state by a fixing frame or a connecting member is used as a guide to move forward toward the arrival side 5 for a certain length while slidingly contacting the opposing surface of the friction cutter plate 6 and the lower floor slab of the existing structure 1. 11 also slides on the sliding surface material 9 and advances simultaneously with the upper floor slab 1a for a certain length at the same time.

At this time, the temporary support work 8 supporting the upper floor slab 1a also moves forward together with the upper and lower floor slabs 1a and 11 while holding the upper floor slab 1a at a constant height position.

After the upper and lower floor slabs 1a and 11 of the existing structure 1 and the parallel box-shaped roofs 7 and 7 are integrally propelled to the arrival side 5 for a certain length, the rear portion of the existing structure 1 exposed by the propulsion is destroyed and removed. To do.

The following patent document discloses the construction of a new structure in the case where the existing structure 1 is removed from the existing structure 1 as shown in FIG. The box-shaped roof 7 is installed so as to penetrate the entire circumference and the entire length of the vertical shaft installed on both sides as a protection work for the construction section at a position matching the outer edge of the new structure, and is newly installed in the vertical shaft on the starting side 4. The box 2 for the structure is built, and the box-shaped roof 7 and the internal ground and the box 2 are integrally pushed out to the arrival side. When the existing structure 1 is removed, the existing structure 1 is newly constructed. The existing structure 1 surrounded by the box-shaped roof row is pushed out to the arrival side 5 together with the inner ground by dissociating the box-shaped roof row by cutting and separating it according to the outer edge of the object and dismantling it.
JP, 2016-23430, A

In the conventional methods of Patent Document 1 and Patent Document 2, while the friction cutter plates 6, 6, 6,... 6 made of elongated steel plates cut friction of the existing structure with the ground, the existing structure is reached 5 After that, the existing structure exposed by the propulsion is destroyed and removed.

It is necessary to lay a plurality of friction cutter plates 6, 6, 6,... 6 in parallel on the upper surface of the upper floor slab 1a of the existing underground structure 1 with both end faces in the lengthwise direction thereof in contact with each other. Becomes

The operation of laying the friction cutter plate 6 is performed by excavating the ground under the rail 3 to expose the upper floor slab 1a of the existing underground structure 1, laying it on the upper floor slab 1a, and then backfilling the ground. Alternatively, with the ground as it is, the friction cutter plate 6 is press-fitted so as to penetrate the upper floor slab 1a of the existing underground structure 1 from the starting side 4 toward the reaching side 5, or from the reaching side 5 with a wire or the like. It must be done by towing.

In Patent Document 3, the existing structure 1 is removed by cutting the existing structure 1 along the outer edge of the new structure, separating the existing structure 1, and pushing out the box-shaped roof row. Is pushed out to the arrival side 5 together with the inner ground and is dismantled. The box roof 7 is installed at a position that matches the outer edge of the new structure and penetrates the entire circumference and the entire length. It must surround the earth and sand.

That is, a large number of box-shaped roofs 7 need to be arranged.

The object of the present invention is to eliminate the inconvenience of the conventional example, to partially remove the existing tunnel structure from the existing tunnel structure, and then to construct a new tunnel structure. We provide a method for removing existing tunnel structures using the box roof method, which enables safe and fast removal of existing tunnel structures with a small number of steps by using the extrusion of a box roof, and improves the construction speed. To do.

In order to achieve the above object, the present invention according to claim 1 provides a new tunnel structure in the case of partially removing the existing tunnel structure from the existing tunnel structure and then constructing a new tunnel structure. To construct the building, a box-shaped roof is installed from both the start side and the arrival side, which are installed on both sides as protective work for the construction section, to penetrate the construction section at a position that matches the outer edge of the new tunnel structure, and a new construction is made on the start side. The box for the tunnel structure is built and pushed out to the box-shaped roof, the box and the arrival side. To remove the existing tunnel structure, the existing tunnel structure is cut and separated, and the existing tunnel structure below the box roof is removed. The cutting and separating part of the object is temporarily received by the supporting work with rollers, and further, the lower part of the box roof and the cutting and separating part of the existing tunnel structure are locked, and the cutting and separating part of the existing tunnel structure is The main idea is to push it out together with the box for the new tunnel structure, push it out toward the arrival side, and dismantle it.

According to the present invention as set forth in claim 1, the cutting/separating portion of the existing tunnel structure is temporarily received by a supporting work with rollers, and the lower side of the box-shaped roof and the cutting/separating portion of the existing tunnel structure are locked. Thus, the cut and separated portion of the existing tunnel structure can be extruded together with the box-shaped roof and the box for the new tunnel structure, and can be disassembled by being pushed out to the arrival side.

In that case, the box-shaped roof may be arranged in a horizontal row, and it is not necessary to arrange many box-shaped roofs.

The present invention according to claim 2 is characterized in that the lower side of the box-shaped roof and the cut and separated portion of the existing tunnel structure are fixed by a bracket.

According to the second aspect of the present invention, the lower side of the box-shaped roof and the cut and separated portion of the existing tunnel structure can be securely fixed and locked by the bracket.

The gist of the present invention according to claim 3 is to form a rail laying ground for a support work with a roller by filling with a filling material in a void portion of an existing tunnel structure.

According to the present invention as set forth in claim 3, the supporting work with the rollers can be formed by filling the rail laying ground in the void portion of the existing tunnel structure by filling the rails in a stable state. You can lay it and move the support work.

As described above, according to the method for removing an existing tunnel structure by the box-shaped roof construction method of the present invention, this existing tunnel structure is partially removed from the existing tunnel structure, and then a new tunnel structure is constructed. In this case, the existing tunnel structure can be safely and quickly removed by a small number of steps by utilizing the extrusion of the box-shaped roof of the box-shaped roof construction method, and the construction speed and the like can be improved.

It is a vertical side view showing one embodiment of the existing tunnel structure removal construction method by the box roof construction method of the present invention. It is a cross-sectional plan view showing one embodiment of the existing tunnel structure removal construction method by the box-shaped roof construction method of the present invention. It is a vertical side view of the 1st process which shows one embodiment of the removal construction method of the existing tunnel structure by the box roof construction method of the present invention. It is a vertical side view of the 2nd process which shows one embodiment of the removal construction method of the existing tunnel structure by the box roof construction method of the present invention. It is a vertical side view of the 3rd process which shows one embodiment of the removal construction method of the existing tunnel structure by the box roof construction method of the present invention. It is a vertical side view of the 4th process which shows one embodiment of the removal construction method of the existing tunnel structure by the box roof construction method of the present invention. It is a vertical section side view of the 5th process which shows one embodiment of the existing tunnel structure removal construction method by the box-shaped roof construction method of the present invention. It is a vertical side view of the 6th process which shows one embodiment of the existing tunnel structure removal construction method by the box-shaped roof construction method of the present invention. It is a longitudinal side view of the 7th process which shows one embodiment of the removal method of the existing tunnel structure by the box roof construction method of the present invention. It is a vertical side view of the 8th process which shows one embodiment of the removal method of the existing tunnel structure by the box roof construction method of the present invention. It is a vertical side view of the 9th process which shows one Embodiment of the removal method of the existing tunnel structure by the box-shaped roof construction method of this invention. It is a vertical side view of the 10th process which shows one embodiment of the removal construction method of the existing tunnel structure by the box roof construction method of the present invention. It is a vertical side view of the 11th process which shows one Embodiment of the removal method of the existing tunnel structure by the box-shaped roof construction method of this invention. It is a vertical side view of the 12th process which shows one embodiment of the removal method of the existing tunnel structure by the box roof construction method of the present invention. It is a vertical section side view of the 13th process which shows one embodiment of the existing tunnel structure removal construction method by the box roof construction method of the present invention. It is the side view which notched one part which shows a prior art example. It is a vertical side view which shows another prior art example.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a vertical sectional side view showing an embodiment of a method for removing an existing tunnel structure by a box-shaped roof construction method according to the present invention, and FIG. 2 is a transverse plan view of the same construction as the conventional example shown in FIGS. 16 and 17. Elements are given the same reference numerals.

In the figure, 1'indicates an existing tunnel structure, and an upper floor slab and a lower floor slab having a constant width and a constant thickness over the entire length, and upper and lower end faces are integrally connected to lower surfaces of both upper and lower slabs. It is a concrete structure with a rectangular cross section consisting of both side walls with a certain height.

When constructing the existing tunnel structure 1′ by replacing the existing tunnel structure 1′ with a small new tunnel structure A having a different sectional diameter, the existing tunnel structure is partially removed from the existing tunnel structure. Then, when constructing a new tunnel structure after that, the existing tunnel structure 1′ is partially removed from the existing tunnel structure 1′, and then the new tunnel structure A is constructed.

The temporary earth retaining member 21 is installed with a sheet pile or the like, with the side for starting the box 2 as the starting side 4 and the side for pushing out a part of the existing structure 1 as the reaching side 5.

The construction of the new tunnel structure A is carried out at a position where the box-shaped roof 7 is fitted to the outer edge of the new tunnel structure A from the starting side 4 of the shaft starting side 4 and the reaching side 5 installed on both sides as a protection work for the construction section. Installed by penetrating the construction section.

A friction cutter plate 6, which is a thin steel plate, is arranged on the box-shaped roof 7 in an overlapping manner. The friction cutter plate 6 is intended to reduce the frictional resistance when the box 2 is propelled or towed and to cut the edge with the surrounding ground.

A plurality of steel box-shaped roofs 7 each having a rectangular cross section on which the friction cutter plates 6 are mounted are placed in parallel to form a parallel box-shaped roof stacked in a row.

The front end of the friction cutter plate 6 is detachably fixed to the tip of the box-shaped roof 7, and an auger (not shown) is inserted into the box-shaped roof 7 to drive each box-shaped roof 7 into the ground. Then, while excavating the ground in front of the ground, the ground is propelled from the reaching side 5 toward the starting side 4.

In the illustrated example, the box-shaped roof 7 is inserted from the arrival side 5 toward the starting side 4, but conversely, it may be inserted from the starting side 4 toward the reaching side 5.

The existing tunnel structure 1'is cut and separated with a wire saw (cutter) or the like, and the portion 1d overlapping the new tunnel structure A is separated from the others.

In addition, the inner space of the existing structure 1 is filled with a filling agent 24 to form a ground, a rail 25 is laid on the ground, and a supporting work 26 with rollers (wheels) can be run on the rail 25. To install.

The supporter 26 with rollers supports the portion 1a overlapping the new tunnel structure A.

Further, the lower side of the box-shaped roof 7 and the cut-and-separated portion of the existing tunnel structure 1′ are locked by the bracket 27, and the cut-and-separated portion 1d is pushed out together with the box-shaped roof and the box for the new tunnel structure. , Push to reach side 5 and dismantle.

FIGS. 3 to 15 show the details of the above steps. As the first step, as shown in FIG. 3, temporary construction preparation is carried out by the construction on the starting side 4 and temporary earth retention is placed to impede the water channel structure. Parts are removed and lining boards are installed.

As the second step, as shown in FIG. 4, as the construction of the starting side 4, ground improvement (vertical construction), ground improvement (horizontal construction), cleaning of the inside of the waterway structure, and construction of the reaction force concrete 28, A filling operation 24 is performed in the inner space of the existing structure 1 to form the ground, and the rail 25 is laid on the ground.

In this embodiment, a chemical solution injection 29 is added as a ground improvement.

As the construction on the arrival side 5, a temporary earth retaining is placed, an obstacle part of the waterway structure is cleaned, and the inside of the waterway structure is cleaned.

As a third step, as shown in FIG. 5, as a preparation for the promotion of the box-shaped roof 7, a roof propulsion stand 30 is built, and a propulsion jack 31 and a reaction material 32 are installed.

As a fourth step, as shown in FIG. 6, the pipe roof 33 is prepared for propulsion, and the pipe roof 33 is propelled by the propulsion jack 31, the reaction material 32, and the like. The pipe roofs 33 are arranged as safety fences at the left and right ends of the box-shaped roofs 7 arranged side by side.

As a fifth step, as shown in FIG. 7, the cross girder frame 34 is built on the starting side 4, and the propulsion (source push) jack 17 and the spacer 35 are arranged.

Reference numeral 36 in the drawing denotes a blade opening provided at the head of the box, and the blade opening 36 is carried in and installed. Further, a jack housing pipe 37 housing a small jack is attached to the rear end of the box-shaped roof 7, and a fixing work 38 for the friction cut plate 6 is provided.

In addition, the existing tunnel structure 1'is cut and separated by a wire saw (cutter) or the like, the portion 1d overlapping the new tunnel structure A is separated from the others, and the supporting work 26 with rollers is supported.

A supporter 26 with a roller is movably installed on a rail 25 laid on the ground by a filling material 24.

As a sixth step, as shown in FIG. 8, the box-shaped roof 7 is blank-pressed (cutting the edges), and the box-shaped roof 7 is prepared to be pushed out to the arrival side 5 together with the portion 1d overlapping the new tunnel structure 1'.

As a seventh step, as shown in FIG. 9, the spacer 35 is removed, the first box 2 is carried in, installed, and the pressing angle 23 is set, and the first box 2 is pushed by air.

As shown in FIG. 10 as the eighth step, after the first box 2 reaches a predetermined position, the propulsion equipment of the propulsion equipment is partially removed, and the second box 2 is loaded and installed. The box 2 and the second box 2 are propelled.

As a ninth step, as shown in FIG. 11, by repeating the same steps, the first to ninth boxes 2 are propelled, the skirt 39 and the intermediate push jack 15 are carried in, installed, and the box 2 is propelled. The box-shaped roof 7 and the cut and separated portion 1d of the existing tunnel structure 1'are extruded toward the arrival side 5 side, dismantled, and removed.

As shown in FIG. 12 as the tenth step, the above steps are repeated to propel the first to eighteenth boxes 2, and after reaching the predetermined position of the first to eighteenth boxes 2, the propulsion equipment is partially installed. The skirt 39 and the intermediate push jack 15 are carried in after removal, and the first to eighteenth boxes 2 are propelled.

As the eleventh step, as shown in FIG. 13, the box-shaped roof 7 is pushed out and removed along with the propulsion, and the above steps are repeated to propel the first to twenty-second boxes 2. After reaching the predetermined position of the first to twenty-second boxes 2, the blade 36 and the propulsion equipment are partially removed.

As a twelfth step, as shown in FIG. 14, the above steps are repeated to propel the first to 26th boxes 2, and after the first to 26th boxes 2 arrive, the skirt 39 and the intermediate push jack 15 are attached. It removes, the 1st-the 26th box 2 are joined, spacer (reaction material) 35 is installed, and it is made to propel, and propulsion is completed.

As a thirteenth step, as shown in FIG. 15, the propulsion equipment is removed, backfill grout is injected into the outer periphery of the box body 2, and filling grouting is injected into the pipe roof.

1 Existing structure 1'Existing tunnel structure 1a Upper floor slab 1b Side wall 1c Lower floor slab 1d Part overlapping new tunnel structure 2 Box body 3 Rail 4 Starting side 5 Reaching side 6 Friction cutter plate 7 Box roof 8 Temporary support work 9 Sliding surface material 11 Lower floor slab 15 Middle push jack 17 Propulsion (original push) jack 18 Strut 20 Filler 21 Temporary earth retaining member 23 Pusher work 24 Filling fill 25 Rail 26 Roller support 27 Bracket 28 Reaction force Body concrete 29 Chemical injection 30 Roof propulsion stand 31 Propulsion jack 32 Reaction material 33 Pipe roof 34 Double girder frame 35 Spacer 36 Blade edge
37 Jack Storage Tube 38 Fixing 39 Skirt

Claims (3)

When this existing tunnel structure is partially removed from the existing tunnel structure and then a new tunnel structure is constructed, the construction of the new tunnel structure is started on both sides as protective work in the construction section. Side and arrival side, a box-shaped roof is installed through the construction section at a position that matches the outer edge of the new tunnel structure, and a box for the new tunnel structure is built on the starting side, and the box-shaped roof and box It is pushed out to the body and the arrival side, when removing the existing tunnel structure, the existing tunnel structure is cut and separated, and the cut and separated part of the existing tunnel structure below the box-shaped roof is temporarily received by the support work with rollers, Furthermore, by locking the lower part of the box roof and the cutting and separating part of the existing tunnel structure, and pushing the cutting and separating part of the existing tunnel structure together with the box roof and the box for the new tunnel structure, A method for removing an existing tunnel structure by a box-shaped roof construction method characterized by pushing out and dismantling. The method for removing an existing tunnel structure by the box roof method according to claim 1, wherein the lower side of the box roof and the cut and separated portion of the existing tunnel structure are fixed by a bracket. The existing tunnel structure by the box-shaped roof construction method according to claim 1 or 2, wherein a filling material is filled in a void portion of the existing tunnel structure to form a rail laying ground for supporting work with rollers using the filling material. Method of removing things.

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